Shutdown produces errors in log

2016-03-21 12:16:14,884 WARN [FelixStartLevel] c.a.p.osgi.factory.OsgiBundlePlugin Cannot disable Bundle 'rome.rome-1.0', not ACTIVE
2016-03-21 12:16:14,885 WARN [FelixStartLevel] c.a.p.osgi.factory.OsgiBundlePlugin Cannot disable Bundle 'com.springsource.org.jdom-1.1.0', not ACTIVE
2016-03-21 12:16:14,885 WARN [FelixStartLevel] c.a.p.osgi.factory.OsgiBundlePlugin Cannot disable Bundle 'com.springsource.net.jcip.annotations-1.0.0', not ACTIVE
2016-03-21 12:16:14,886 WARN [FelixStartLevel] c.a.p.osgi.factory.OsgiBundlePlugin Cannot disable Bundle 'com.atlassian.util.concurrent.atlassian-util-concurrent-3.0.0', not ACTIVE
2016-03-21 12:16:14,898 WARN [FelixStartLevel] c.a.p.osgi.factory.OsgiBundlePlugin Cannot disable Bundle 'com.atlassian.bundles.json-20070829.0.0.1', not ACTIVE
2016-03-21 12:16:14,954 ERROR [localhost-startStop-2] c.a.e.i.AsynchronousAbleEventDispatcher There was an exception thrown trying to dispatch event [com.atlassian.plugin.event.events.PluginFrameworkShutdownEvent@179886e8] from the invoker [SingleParameterMethodListenerInvoker
{method=public void com.atlassian.plugin.loaders.ScanningPluginLoader.onShutdown(com.atlassian.plugin.event.events.PluginFrameworkShutdownEvent), listener=com.atlassian.plugin.loaders.BundledPluginLoader@3312ea41}
]
java.lang.RuntimeException: java.lang.NullPointerException
at com.atlassian.event.internal.SingleParameterMethodListenerInvoker.invoke(SingleParameterMethodListenerInvoker.java:50) ~[atlassian-event-3.0.0.jar:na]
at com.atlassian.event.internal.AsynchronousAbleEventDispatcher$1$1.run(AsynchronousAbleEventDispatcher.java:46) ~[atlassian-event-3.0.0.jar:na]
at com.google.common.util.concurrent.MoreExecutors$DirectExecutorService.execute(MoreExecutors.java:299) [guava-18.0.jar:na]
at com.atlassian.event.internal.AsynchronousAbleEventDispatcher.dispatch(AsynchronousAbleEventDispatcher.java:105) [atlassian-event-3.0.0.jar:na]
at com.atlassian.event.internal.LockFreeEventPublisher$Publisher.dispatch(LockFreeEventPublisher.java:260) [atlassian-event-3.0.0.jar:na]
at com.atlassian.event.internal.LockFreeEventPublisher.publish(LockFreeEventPublisher.java:102) [atlassian-event-3.0.0.jar:na]
at com.atlassian.stash.internal.event.TransactionAwareEventPublisher.publish(TransactionAwareEventPublisher.java:84) [bitbucket-platform-4.4.1.jar:na]
at com.atlassian.plugin.event.impl.DefaultPluginEventManager.broadcast(DefaultPluginEventManager.java:73) [atlassian-plugins-core-4.1.1.jar:na]
at com.atlassian.plugin.manager.DefaultPluginManager.broadcastIgnoreError(DefaultPluginManager.java:2081) [atlassian-plugins-core-4.1.1.jar:na]
at com.atlassian.plugin.manager.DefaultPluginManager.shutdown(DefaultPluginManager.java:704) [atlassian-plugins-core-4.1.1.jar:na]
at com.atlassian.stash.internal.plugin.SpringPluginSystemLifecycle.stop(SpringPluginSystemLifecycle.java:45) [bitbucket-platform-4.4.1.jar:na]
at com.atlassian.stash.internal.spring.AbstractSmartLifecycle.stop(AbstractSmartLifecycle.java:36) [bitbucket-platform-4.4.1.jar:na]
at org.springframework.context.support.DefaultLifecycleProcessor.doStop(DefaultLifecycleProcessor.java:229) [spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.context.support.DefaultLifecycleProcessor.access$300(DefaultLifecycleProcessor.java:51) [spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.stop(DefaultLifecycleProcessor.java:363) [spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.context.support.DefaultLifecycleProcessor.stopBeans(DefaultLifecycleProcessor.java:202) [spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.context.support.DefaultLifecycleProcessor.onClose(DefaultLifecycleProcessor.java:118) [spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.doClose(AbstractApplicationContext.java:975) [spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.close(AbstractApplicationContext.java:934) [spring-context-4.2.4.RELEASE.jar:4.2.4.RELEASE]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_65]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_65]
at java.lang.Thread.run(Thread.java:745) [na:1.8.0_65]
... 11 frames trimmed
Caused by: java.lang.NullPointerException: null
at com.atlassian.plugin.osgi.container.felix.FelixOsgiContainerManager.removeBundleListener(FelixOsgiContainerManager.java:506) ~[atlassian-plugins-osgi-4.1.1.jar:na]
at com.atlassian.plugin.impl.AbstractPlugin.uninstall(AbstractPlugin.java:451) ~[atlassian-plugins-core-4.1.1.jar:na]
at com.atlassian.plugin.loaders.ScanningPluginLoader.onShutdown(ScanningPluginLoader.java:247) ~[atlassian-plugins-core-4.1.1.jar:na]
at com.atlassian.event.internal.SingleParameterMethodListenerInvoker.invoke(SingleParameterMethodListenerInvoker.java:36) ~[atlassian-event-3.0.0.jar:na]
... 22 common frames omitted
2016-03-21 12:16:15,117 INFO [localhost-startStop-2] c.a.s.internal.home.HomeLockAcquirer Releasing lock on /opt/bitbucket/data/shared
2016-03-21 12:16:15,137 INFO [localhost-startStop-2] c.a.s.internal.home.HomeLockAcquirer Releasing lock on /opt/bitbucket/data
2016-03-21 12:16:15,138 INFO [localhost-startStop-2] c.a.s.i.server.BuildInfoLogger Bitbucket 4.4.1 has shut down